Advertisements Note that this is for ListView.builder items, not general stateless vs stateful widget discussion. Stateless listview builder item: Pros I assume each item can be quickly reused on a large list as they don’t contain any state Cons Any changes to any item would require to call setState on list view Stateful listview builder… Read More Stateful vs Stateless widgets for ListView.builder items
Advertisements I want to show the widget when keyboard pops up, but I get the error message ======== Exception caught by rendering library ===================================================== The following assertion was thrown during performLayout(): RenderFlex children have non-zero flex but incoming height constraints are unbounded. When a column is in a parent that does not provide a finite… Read More Flutter doesn't show widget when keyboard pops up
Advertisements Hi. How to make space between items in Listview. I’ve tried changing Column mainAxisAlignment: MainAxisAlignment.start, to MainAxisAlignment.spaceBetween and tried adding padding to the ListView but still no change. Is there anyone who can give an opinion on how to make space between ListView items. Container( color: Colors.white, padding: const EdgeInsets.all(20), child: Column( children: [… Read More Widget ListView: How to make space between items
Advertisements Since the initState function is executed synchronously, how will load() be executed in this case – asynchronously or synchronously? How to be sure of this? class _ExampleState extends State<Example> { @override void initState() { super.initState(); load(); //will it run synchronously or asynchronously? } Future<void> load() async { debugPrint(‘loading’); await doIt(); } … p.s. I… Read More Running an asynchronous function in initState – what type of execution will be?
Advertisements I am two Lists, List numList and List timeList. Every time I click a button firstly I add 1 to numList and DateTime.now() to timeList. When I longPress this button, I want a variable on screen to add each value from numList and inBetween wait eah Duration from timeList. I cant figure out what… Read More Increase number Periodically in Flutter
Advertisements I add Row with children inside [IconButton, Container-> Text, IconButton], but the space between first icon and the container not equal to the space between the container and second icon.. Row( mainAxisAlignment: MainAxisAlignment.spaceEvenly, children: <Widget>[ IconButton( onPressed: () {}, icon: Icon( Icons.arrow_circle_left_rounded, size: 55, color: AppColor.purpleColor, )), Container( width: 80, decoration: BoxDecoration( color: AppColor.purpleColor,… Read More How to set spaces between items on a Row are equals?
Advertisements The print function is defined in both these files: flutter/bin/cache/pkg/sky_engine/lib/core/print.dart flutter/bin/cache/dart-sdk/lib/core/print.dart I opened each of them and modified the function to add this line at the start if (kDebugMode) return; I restarted the IDE, run the app with this code print(kDebugMode); // Prints true The print function shouldn’t have printed anything. If I go… Read More How to modify the `print` function in Dart?
Advertisements I have a scenario in dart where I have a generic type T, which may be <void> at runtime. I need to test if a dynamic variable I get back from a service is of that generic type. However the following test using the is operator fails when T is void, and I’m struggling… Read More How to test if dynamic variable is generic type void in Dart
Advertisements I have a simple custom ListTile component that is wrapped with the Card widget, the content of the card widget are extending past its boundary. class CListItem extends StatelessWidget { final text; const CListItem({super.key, this.text}); @override Widget build(BuildContext context) { return Card( child: ListTile( title: Text(text), leading: Icon(Icons.calendar_today), subtitle: Text(’23/12/2020′), trailing: Icon(Icons.arrow_forward_ios), onTap: ()… Read More ListView item smaller than child content
Advertisements I want to limit list in for in loop. if data list more than 8. It just display 8 list. I’ve add condition like this if (entry.length <= 8) but it not working. poweredareaOfInspec(List < Map < String, dynamic >> areaOfInspec) { try { if (areaOfInspec != null) { var areaOfInspecHtml = ""; for… Read More Limit list data in dart